I'll say

Idioms  

1. Absolutely, I strongly agree. For example, Did you enjoy the film?—I'll say. This phrase is generally used alone and for emphasis. [First half of 1900s] For a synonym, see you can say that again.

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Example Sentences

Perry attorney Alex Spiro said Monday in a statement: “I said it before and I’ll say it again. This is nothing but a 77 million dollar money grab scam.”

From Los Angeles Times

“You think I’m playing with you. And guess what I’ll do? I’ll say, ‘Let’s put all the yellow ones in the yellow container.’

From Los Angeles Times

“To those people I’ll say, ‘Tell that to William Friedkin or Stanley Kubrick,’” Ransone said in an interview with Anthem Magazine.

From Los Angeles Times

“I think it’s a good thing—but, you know, at least to a certain point. There’ll be a point when I’ll say, ‘Please don’t arm anymore, if you don’t mind.’

From The Wall Street Journal

I’ve said it before and I’ll say it again: Your assets are not your children’s inheritance unless they eventually wind up in their bank account upon your death.

From MarketWatch